In addition to the cooling effect, "Mini Air Cooling Fan" operating noise is also widespread concern. Fan noise is noise generated when the size of the fan works, influenced by many factors, in decibels (dB). When measuring the fan noise in the noise is less than 17dB is needed anechoic room in which, one meter from the fan, and the direction of the "Mini Air Cooling Fan" fan shaft is aligned air inlet, using the A-weighted measurements manner. The spectral characteristics of the fan noise is also very important, so we must also use a spectrum analyzer records the fan noise frequency distribution, the general requirements of the fan noise to be as small as possible, but can not exist different tone. In price and performance similar circumstances, to choose long-life product is clearly better protect our investment. "Mini Air Cooling Fan" of life by: motor life, environment, power supply and other factors of the composition.